s4:rpc_server: allow a NULL function pointer in dcesrv_fetch_session_key()

BUG: https://bugzilla.samba.org/show_bug.cgi?id=7113
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11892

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

diff --git a/source4/rpc_server/dcerpc_server.c b/source4/rpc_server/dcerpc_server.c
index fca62290a70edeb957d779907462a2663f50b5aa..b8255ba4dd8e3a25ea516c3eeca423b2f095e26b 100644 (file)
--- a/source4/rpc_server/dcerpc_server.c
+++ b/source4/rpc_server/dcerpc_server.c
@@ -489,7 +489,14 @@ _PUBLIC_ NTSTATUS dcesrv_auth_session_key(struct dcesrv_call_state *call,
 _PUBLIC_ NTSTATUS dcesrv_fetch_session_key(struct dcesrv_connection *p,
                                  DATA_BLOB *session_key)
 {
-       NTSTATUS status = p->auth_state.session_key(p, session_key);
+       struct dcesrv_auth *auth = &p->auth_state;
+       NTSTATUS status;
+
+       if (auth->session_key == NULL) {
+               return NT_STATUS_NO_USER_SESSION_KEY;
+       }
+
+       status = auth->session_key(p, session_key);
        if (!NT_STATUS_IS_OK(status)) {
                return status;
        }